John s



i glnitl tatrs ateut @ffice JOHN S. HULL, OF' GINCINNATLOHIO.

Letters Ptztent'No. 76,195, dated I larci' 3l, 1,868.

IMPROVEMENT tu ets-unirme.

@in tlgrmlr tuant tu it tigen Etnias tatntt mit mating pitt tt tige were.

TO ALL WHOM IT MAY CONGERN:

Be it known that I, JOHNS. HULL, of Cincinnati, in the county of Hamilton, and State of Ohio, have vinvented an Improved 'IinnersFire-Pot or Furnace, for heating soldering-irons, by burning hydrocarbon fluids; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this specification- Y Figure 1 being a view of the apparatuscomplete, the fluid-fountain and burner being shown in elevation, and the heater, or furnace proper, in vertical section. i

Figure 2i, a central vertical section of the burner on an enlarged scale.

Figure 3, a frontview cf the heater on an enlarged scale.

Like letters designate corresponding parts in all of the figures.

In the application of the hydrocarbon fluids, such as benzine, petroleum, coaloil, &c., or alcohol, to this use, the Huid is cenflncd in a strong, close' vessel, A, in which atmospheric air is compressed by means of an airpump or condenser, B, for the purpose of forcing the fluid to thc burner in constant quantity, and with such pressure as to produce a blow-pipe ame of intense heating power. The principal appendages of the air-pump and the fountain area cut-eti' valve, C, to secure the air when once compressed withinv the vessel; a vent-valve, d, to let off thecompressed air when the fountain is not in use; ducts a a, outside ofx the vessel A respectively, to conduct the air from the pump to the top of the vessel, and the iiuid from the bottom thereof to the pipe E, which conducts the fluid to the burner. The ducts are located outside of the vessel, for convenienceof con struction and repair. The burner gasifics the fluid and superheats the gas before it issues in the burning-jet, First, the fluid presses `upward fromthe conducting-pipe E through a small passage, t, into the enlarged diskn shaped retort, or gasiiier and superbe: 5er, as well as dame-spreader, G, which has an annular chamber, o, therein, for containing a surplusof the just generated gas more than what passes away for immediate use; then the gas descends through another small passage, t', down into the burner-head H, where another enlargedk chamber, 7c, receives it, and retains also a surplus quantity, so as to insure a constant and full supply to issue at the jet-A aperture j, which is located centrally under the disk G. The flame of the jet spreads around the passages h and ,(which form hollow supports for the retort-disk GQ and under the said disk. The cone-point I, which closes and regulates the dame of the jet, is packed with asbestos, s, compressed by a screw, 2J. The annular chamber o, in the disk G, is enclosed by a cap, g, which screws down over the disk, and has the joint packed With asbestos. Thus ready access may be hadto the inside of the retort for cleansing'it outif it becomes foul. The passages L and z' open at the upper end out through the disk-capp, and these openings are closed with screw-plugs Z Z, or their eduivalenawhiphcan be removed at' any time, for gaining access to the. passages to clear them out. This arrangement is important, since the small passages occasionally become clogged with the solid impurities ofthe oils. Similar plugs and n close openings respectively into passages g and k in the disk G and'burner-head H. The heater, M, is placed over the burner,having a cone or draught-regulator,N, (represented as a double cone or conical, both upward and downward, in' the drawingsj extending downward from its bottom, P, in which the burner isllocated. The heater is substantially of the form shown, being convex at the top, with a swell or dome, O, in the middle, over the burner, for the purpose of concentrating and reverberating the heat downward upon the solderingdro'ns, which are placed over the burner. The mouth of the heater is open for the reception of the solderingirons, which rest on cross=bars or rods v v.

An important feature of the heater is a number of apertures, t t, 'through the bottom thereof, around the burner'cone N, and another set of holes, u u, in the top, around the reverberating swell O. Without these apertures there would notv be a sufficient supply of air to produce perfectcombustion and intense heat.

This furnace may bc used for. other analogous purposes, such as for melting metals and alloys in small quan-v tities. It heats Vrapidly and uniformly, and is very economical in use.

What I claim as my invention, and desire to secure byLetters Patent, is-

A burner, supplied by the force of compressed air, in combination with atinners fire-pot, for the purpose herein specified.

I also claim the chamberedgasifying and superheating disk G, snbstantiallyas and for the purpose herein set forth.

I also claim theiscrew-capg, applied to tHe disk G, substantially as and foivbhe pupose specified. I also claim the enlarged passage c inthe burner-head, for the puiiposeA s et fo'th. I also claim the screw-plugs Z Z,- m m, substantially as and for the plirppse'herein specified.

I also claim the swell or dome O, in the top of the heatelg subsitantiaily as and forV the purpose herein specied.

JOHN S. HULL. Witnesses:

J. S. BROWN, WM. F. BROWNE. 

